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In order to realize intelligent monitoring and management of air quality index,designs and realizes a kind of index of air quality monitoring system based on SnO₂ artificial olfactory detection,the system through the air quality index field acquisition,processing and transmission network monitoring node air quality index data,using ARM S3CA510B DTU data transmission,air quality index data the transmission of high efficiency,large quantities of CO,SO₂,etc; Use gathering node module through the GPRS network to pass data to the regulatory terminal,regulatory management command through GPRS network terminal feedback to convergence monitoring nodes,to realize the remote monitoring of air quality index data; The monitoring terminal for management personnel to provide different monitoring treatment,control and monitoring air quality index related data retrieval and summary analysis of man-machine interface,etc. Air quality index of the system flow chart of the flow of information transfer has carried on the design,system data through the serial port communication code are given and the system monitoring terminal use socket implementation of network communication core source code. Experimental results show that,compared with the traditional system,the proposed system can real-time monitor the concentration of CO,SO₂ pollution gas in the air,has the very high practicability and effectiveness.